Create 3 curves/pipes that intersect holes in multiple objects and are equal distance from each other
Final



Bevel for Curve (wires)

In this step you will create Bevel object for main curve. 


  Changed to method Duarte Farrajota Ramos mentioned in comments.



Shift+A > Curve > Circle.
In Edit Mode select all and duplicate your Circle than scale it down.
Turn on Snapping and move duplicated Circle up.
Switch Pivot Center to 3D Cursor.
Duplicate smaller Circle and rotate it by 120 degrees.
Repeat step 5. for another Circle.
Remove bigger Circle.




Main Curve

Here you will make Bezier Curve which you can manipulate as you want and it will keep your wire in place. 


Shift+A > Curve > Bezier.
Go to Data tab.
Select Bevel Object.
Crank up Preview Resolution.
Most probably you will need to scale down your Bevel Object.




Placing Main Curve in holes

I've used a bit tedious way. Most important thing here is to have the same number of vertices in Bezier Curve (Main) as number of hole objects. 


Select inner loop of hole object and place 3D Cursor in it - Shift+S.





Select vertex from Main Curve and move it to 3D Cursor - also Shift+S.





Repeat for every hole selecting another vertices from Main Curve.
Select all vertices in Main Curve and V > Vector than V > Automatic to have unified handles.
Tweak handles to be round.